Gear pump brake for revolving doors



Nov. 14, 1950 i H. G. E. NORDIN GEAR PUMP BRAKE FOR REVOLVING DOORS 3 Sheets-Sheet 1 Filed Aug. 8, 1946 Nov. 14, 1950 H. G. E. NORDIN GEAR PUMP BRAKE FOR REVOLVING DOORS Filed Aug. 8, 1946 3 Sheets-Sheet 2 NOV. 14, 1950 NORDIN 2,529,811

GEAR PUMP BRAKE FOR REVOLVING DOORS Filed Aug. 8, 1946 3 Sheets-Sheeti I 44WM //0/ ye:

Patented Nov. 14, 1950 UNITED STATES PATENT OFFICE GEAR PUMP BRAKE FOR REVOLVING DOORS Holger G. E. Nordin, Chicago, 111.

Application August 8, 1946, Serial No. 689,080

3 Claims. (Cl. 18892) This invention relates to revolving doors and more particularly to governors or speed control means therefor designed to control the speed at which the door may be revolved, to prevent spinning thereof and further to prevent sudden starts and abnormally rapid acceleration; this restraining means released immediately upon achievement of its objective.

One object is to provide speed control means of this type of compact design that is capable of easy installation, having a wide range of operative adjustment, that is self-lubricating in operation, free from fluid leakage, smooth and positive in action, completely hydraulic, that releases instantly after operation and that in normal operation is free from any binding action.

A further object is to provide speed control means having no exposed parts but wherein all parts are so disposed and assembled as to be readily accessible for inspection, repair or replacement when necessary; and wherein motivation is had from the door column through a series of gears activating the fluid compression pump at a stepped-up ratio of approximately eighteen to one resulting in compression of the fluid within the pump passages that acts upon the control valve effecting the desired result. Normal door operation is pressure free and sets up no resistance but door movement beyond a predetermined speed is followed immediately by a resistant pressure that effectually reduces such speed to normal whereupon this pressure, .is promptly abated automatically to again permit normal door operation.

A further object is the provision of speed control means for revolving doors wherein the control valve is disposed in a vertical position thereby utilizing gravity to assist in its release movement. Other objects, novel features and advantages of arrangement, construction and design comprehended by the invention are hereinafter more fully pointed out or made apparent from the following description of a preferred embodiment as illustrated in the accompanying drawings wherein like reference characters denote corresponding parts throughout.

In the drawings:

Fig. 1 is a top plan view of the door stop housmg.

Fig. 2 is a view of this housing in side elevation.

Fig. 3 is a rear end view of this housing in elevation.

Fig. 4 is a view of the housing in front end elevation.

2 Fig. 5 is an enlarged longitudinal vertical sectional view through Fig. 1 on the line 5--5 thereof but showing a portion of the trolleyframe. Fig. 6 is a vertical cross sectional view through Fig. 8 on the line 66.

Fig. 7 is a longitudinal vertical sectional view, enlarged, through Fig. 1 on the line I'I.

Fig. 8 is a horizontal longitudinal sectional view, partly in plan, taken on the line 8-8 of Fig. 2.

Fig. 9 is a vertical cross sectional view through Fig. 8 on the line 99' but showing a portion of the housing support.

Fig. 10 is an enlarged plan view of the pump, parts being shown in section.

' Fig. 11 is a view similar to Fig. 10 but partly sectioned to show the inlet port, and,

Fig. 12 is an enlarged detail sectional View through the pump showing the valve assembly, taken on the line I2-I2 of Fig. 11.

The instant control is adapted to fit almost any type of revolving door, even those provided with but a minimum overhead clearance. It is operatively supported upon the door column and cradled in the conventional trolley frame IA associated with the regulation type of revolving door. The reference numeral I denotes a door column provided with the usual leaves, not here shown.

Received upon column I is the housing 2 engaging same through the medium of ball bearings 3, a large drive gear 4 keyed to the upper end of column I within said housing being in mesh with the pinion 5 fast upon shaft 6 cperatively arranged in said housing and at its upper end carrying a large transmission gear I likewise arranged and in mesh with a pinion 8 fast upon shaft 9 extending through housing partition I0 into the pump II and therein supported and provided with the pump drive pinion I2 in mesh with the transmission pinion I3 fast upon pin I4 supported in the pump casing and actuating the pump. As the door column rotates the pump is actuated by the gear train just described. A housing cover I5 removab-ly retained in place by screws I6 affords access to the housed mechanism.

The walls of housing 2 and partitions Ill and I1 define a fluid reservoir wherein the said pump I I is immersed defining fluid passageways I8 between said pump, housing and partitions, said pump in operation pumping the fluid from one passageway IS in the reservoir between I! and the pump through intercommunicating ducts I9, 20, 2|, Z2, 23, all in said pump, back into the reservoir. Normal rotation of the door column will set up normal pump operation forcin fluid in normal quantity through the pump and back into the reservoir and merely lubricating the transmission mechanism. Extending freely through the cover l5, through the housing 2 and threaded into engagement with the pump casing is the sleeve 24 receiving and threaded into engagement with the needle valve 25 extending into the fiuid channel 22, of channel diameter, and adapted in one position to block said channel completely and seat in the wall indenture 26, said valve above said cover havin fast thereupon the pinion 27 in mesh with the pinion 28 fast upon a stub shaft 25 supported in a bracket 30 forming part of the overhead trolley-supported mechanism.

Bracket 30 also operatively supports the stub shaft 3| fast upon which is the pinion 32 in mesh with pinion 33 fast upon the vertical valve stem =34 extending through a vertically disposed tubular 'nut- 35 adjustably received in the threaded valve casing 36' receiving nut 60 upon itsupper end, said nut and valve casing being Referring again to said tubular nut 35 same is 1 formed in its lower portion with a cavity 49 of substantial'size through and beyond which said valve stem 34 extends longitudinally and centrally and likewise through valve casing 36, nut 66 and through a valve port 4! and through the 1- contracted lower end of said sleeve 38 and therebeyond. Disposed upon said valve stem 34 and abutting the base of cavity All is the expansion coil spring 42 that at its lower end abuts the pressure valve 43 upon said valve stem yieldingly disposed upon annular shoulder or Valve seat 44 formed by the juncture of the normal and contracted portions'of sleeve 38, said shoulder 44 being spaced from shoulder and defining a valve-chamber therewith in said sleeve. said cylindrical valve casing 36 is formed with diametrically opposed perforations 46, 46 and with a relatively large annular recess 47 registering therewith while said sleeve 38 is formed with diametrically opposed perforations d8, 48 in line with said perforations 46 and in registration with said recess '41 to permit passage of fluid through said jacket and sleeve in intermediate positions of valve 43. By means of needle valve 25 the volume of fluid passing through channel "or duct '22 maybe regulated or completely shut off, said valve being set by manual adjustment.

A flexible shaft'ZiQ having an operating handle of conventional type engages the shaft 29 to rotatesa'rne and pinion 28 fastupon said valve 'stem to raise and lower same. Adjustment of valve 43 is had by means of flexible shaft 5%] engaging shaft 3! connected by pinions 32, 33

to thestem 34 of said valve to increase or diminish the spring pressure upon same so that a predetermined liquid pressure may effect valve opening.

In operation a rapid door movement will cause the gear and pinion chain to increase the pump speed which will greatly accelerate the liquid flow increasing the pressure upon valve 33 raising it from its seat. This will afford some relief 'by permitting a liquid flow about said valve, -normally closed, into 'valve casing 36 and out through perforations 4S, tfi'and recess 4] into The the reservoir. When this pressure becomes too great the valve 43 will seat in valve port 4| thus completely checking the liquid flow or circulation and arresting further movement of the gear train decreasing and stopping the door movement. The pump has now been stopped and with the fluid flow arrested the pressure will drop and spring 42 will again seat valve 43 upon shoulder 44 releasing fluid pressure and again permitting normal fluid circulation as the door is operated in normal manner.

What is claimed is:

1. In fluid brakes for revolving doors, a housing, a fluidreservoir in said housing, a pump immersed in said reservoir, ducts in said pump communicating with said reservoir, a needle valve leading into said pump controlling the liquid flow through one of said ducts, a sleeve in said housing extending through said reservoir into said pump communicating with one of said ducts, a valve seat in said sleeve, said sleeve formed with opposed perforations opening into said reservoir, a valve casing in said sleeve formed with a valve port in its base and with opposed perforations and an annular recess in registry with said sleeve perforations, a pressure sensitive valve connecting said sleeve and valve casing controlling the flow of liquid through said members, said valve y-ieldingly seating in said valve port but normally disposed upon said valve seat, and manually operable means for adjusting said pressure valve.

2. In fluid brakes for revolving doors, a housing, a fluid reservoir in said housing, a pump immersed in said reservoir, intercommunicating ducts in said pump communicating with said reservoir, a needle valve leading into said pump and controlling the liquid flow through one of said ducts, a sleeve in said housing extending through said reservoir into said pump communicating with one of said ducts, said sleeve having two interior annular shoulders spaced apart and formed with opposed lateral perforations opening into said reservoir, a valve casing in said sleeve received upon one of said shoulders and formed with a valve port and with opposed lateral perforations and with an annular recess registering therewith, said perforations and recesses registering with said sleeve perforations, a pressure sensitive valve having a stem extending through'said valve casing and sleeve and normally disposed upon the second sleeve shoulder then forming a closure for said sleeve but yieldingly leaving said shoulder and under increasing pressure closing said valve casing'port, and manually operable means for adjustingsaid pressure valve.

3. In fluid brakes for revolving doors, a housing, partitions in said housing defining separate compartments, one of said compartments forminga fluid reservoir, a pump immersed in said fluid reservoir defining liquid passageways thereabout, intercommunicating ducts in said pump communicating with said liquid pasageways, a

needle valve in said pump controlling liquid flow through one of'said ducts, a'sleeve in said housing extending through said reservoir into said pump communicating with-one of said ducts and with the contents of said reservoir, a valve seat in said sleeve, a valve casing received in said sleeve and formed with perforations registering with said sleeve perforations and a valveport in its base terminating in spaced relation to said sleeve valve seat, the space between said valve port and valve seat forming a valve chamber,

a pressure operated valve in said sleeve yieldingly disposed upon said valve seat but under pressure increasing beyond a predetermined point moving therefrom and closing said valve port, and manually operable means for adjusting said 5 valve.

I-IOLGER. G. E. NORDIN.

REFERENCES CITED The following references are of record in the 10 file of this patent:

Number 6 UNITED STATES PATENTS Name Date Gould Dec. 10, 1907 Price Jan. 6, 1931 Fisher Sept. 1, 1931 Maisch June 2, 1936 Hagenbook July 14, 1936 Byers Jan. 25, 1938 Baash et a1. June 14, 1938 Peterson Nov. 18, 1941 

